JPH0138979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic particle type electromagnetic coupling device, particularly to a magnetic particle type electromagnetic coupling device suitable for use in a vehicle transmission.

[Prior art]

As a conventional device of this type, a damper is attached to a magnetic particle type coupling device to reduce torque fluctuations that cause vehicle vibration.
58-65333 is publicly known.

However, in the device disclosed in JP-A-58-65333, since the damper is exposed outside the driven member, magnetic particles may enter the exposed portion, inhibiting the operation of the damper or causing large wear on the damper. At the same time, there was a drawback that the number of magnetic particles decreased and the transmitted torque decreased. Further, in the conventional device described above, the structure shown in FIG. 1 was used as a means for transmitting torque from the driven member to the damper.

In FIG. 1, 1 is a driven member of a magnetic particle type coupling device, 2 and 3 are a pair of locking plates fixed to the inner circumference of this driven member via a bolt 4, and 5 is a pair of locking plates through which the bolt 4 passes through. A collar 6 mounted between the locking plates 2 and 3 is a damper made of an elastic body, and one end is locked to each of the locking plates 2 and 3. Reference numeral 7 denotes a rotating hub connected to a drive shaft of a transmission (not shown), which engages with the other end of the damper 6 and receives torque from the damper 6, and when the damper 6 is contracted, the bolt 4, It is a rotating hub that receives torque directly through the collar 5.

That is, in the conventional device configured in this way,
If the torque transmission force is small, the broken line A in Figure 1
As the torque transmission force increases, the damper 6 contracts, and the torque is transmitted to the rotating hub 7 via the straight bolt 4 along the path shown by the solid line C. .

For this reason, since torque is always acting on the bolt 4, it is necessary to set the bolt 4 to one with high mechanical strength.As a result, the diameter of the bolt 4 becomes large, and the driven member 1 also becomes large. It had some drawbacks.

[Summary of the invention]

This invention was made to solve the above-mentioned drawbacks, and the second connecting body constituting the driven member is formed from two members divided into two in the axial direction, and a damper is sealed between the two members. By storing the damper in a suitable manner, magnetic particles are prevented from entering the damper, improving the durability of the damper, and preventing the magnetic particles from flowing out, and also fixing the connecting body between the two members of the second connecting body. However, until the damper compresses a predetermined amount, torque transmission between the second connecting body and the rotary plate is performed only through the damper, and when the damper compresses the predetermined amount, it is transmitted through the connecting body, It is an object of the present invention to provide an excellent magnetic particle type electromagnetic coupling device that can be made compact by minimizing the stress applied to the coupling body.

[Embodiment of the Invention] An embodiment of the invention shown in FIGS. 2 to 5 will be described below.

In each figure, reference numeral 8 denotes a driven member, which is a first main body of connection and is connected to a drive shaft of an engine (not shown), and has a connection surface 8a on its inner circumference. A bracket 9 is fixed to the side of the drive member and has cooling fins 9a on its outer periphery. 1
Reference numerals 0 and 11 designate a pair of driven members constituting the second connection main body, which have approximately the same shape and are divided into two in the axial direction, and correspond to the connection surface 8a on the outer periphery through a slight gap in the radial direction. connected surfaces 10a, 11a
have. 12 is this connecting surface 10a, 11a
and magnetic particles filled between the connecting surface 8a of the drive member 8, 13 is the driven member 10,
An electromagnetic coil built into the outer periphery of the drive member 11 magnetizes the magnetic particles 12 to control the connection state between the drive member 8 and the driven members 10 and 11. 14 and 15 are the above driven members 1
With storage recesses formed on the inner circumferences of 0 and 11,
Four locations are formed at approximately equal intervals on the circumference. Reference numeral 16 denotes connecting pins which are connecting bodies that penetrate through the inner circumferential parts of the driven members 10 and 11 and are fixed together, and are located at four locations approximately equally spaced between the storage recesses 14 and 15 of the driven members 10 and 11. A damper 17 made of an elastic body is housed in each of the housing recesses 14 and 15, and is completely sealed from the outside of the drive members 10 and 11. 18 is connected to the driven members 10 and 11 via this damper 17 or the connecting pin 16.
A rotating hub that receives torque from the damper 1 above.
7 can be inserted into the opening 18a and the connecting pin 16
They each have four elongated holes 18b in the circumferential direction through which they pass through and are rotatable in the circumferential direction. The rotating hub 18 is arranged so as to face the driven members 10 and 11 with an interval in between in the radial direction and the axial direction. Reference numeral 18c denotes a spline formed on the inner periphery of this rotating hub, which is fitted with a spline of a drive shaft of a transmission (not shown). 19 is a rotor fixed to the inner circumference of the driven member 11;
0 is a slip ring installed on this rotor,
This is for feeding power to the electromagnetic coil 13. 21 is a bearing provided between the rotor 19 and the bracket 9.

Next, the operation of this embodiment will be explained.

As the engine starts, the drive member 8 is driven to rotate. When the electromagnetic coil 13 is deenergized, the magnetic particles 12 are not magnetized, so the driven member 1
No torque is transmitted to 0 and 11, and only the drive member 8 rotates. Next, when the electromagnetic coil 13 is energized, the magnetic particles 12 are magnetized, the driven members 10 and 11 are driven, and a rotating shaft of a transmission (not shown) is rotationally driven via the damper 17 and the rotating hub 18.

Here, driven member 1 in this example
The torque transmission operation from 0 and 11 to the rotating hub 18 will be described in detail.

First, when the driven members 10 and 11 are rotationally driven in the direction of the arrow R shown in FIG. As shown in FIGS. 4 and 5, the transmitted torque from the driven members 10 and 11 is
It reaches the rotary hub 18 only through the damper 17 without going through the damper 6 (as shown by the broken line A and the dashed line B in FIG. 5).
On the other hand, when the transmitted torque becomes large enough to reach the retracted distance l of the damper 17, the pin 16
8, the transmitted torque is branched into torque that is transmitted to the rotating hub 18 through the connecting pin 16 without going through the damper 17, as shown by the solid arrow C in FIG.

In this way, no torque is directly transmitted to the connecting pin 16 that connects the driven members 10 and 11 until the connecting pin 16 comes into contact with the end surface of the elongated hole 18b of the rotating hub 18. Even when the connecting pin 16 is in contact with the end surface of the elongated hole 18b and torque is transmitted through the connecting pin 16, the connecting pin 16
Since both ends are supported by the driven members 10 and 11, the fixed beams at both ends are bent, and the connecting pin 1
The stress acting on 6 is extremely small.

As a result, since the diameter of the connecting pin 16 can be reduced, the effective magnetic circuit of the driven members 10, 11 can be increased, and this can also contribute to miniaturization of the device.

Further, in the above embodiment, since the cylindrical damper 17 made of a coil spring is housed in the cylindrical recess 14, 15 between the driven members 10, 11 in a sealed state, the damper 17 of the magnetic particles 12 It is possible to completely prevent the magnetic particles 12 from entering the magnetic particles 12, thereby reducing the outflow of the magnetic particles 12.

In addition, although the electromagnetic clutch was illustrated above, it can of course be applied to an electromagnetic brake as well.

〔Effect of the invention〕

As described above, in the present invention, the second connecting body is formed from two members divided into two parts in the axial direction, and the damper is hermetically housed between the two members, so that magnetic particles cannot enter the damper. can be reliably prevented and the outflow of magnetic particles can also be reduced.

In addition, the coupling body is fixed between the two members of the second coupling body, and the torque transmission between the second coupling body and the rotary plate is performed only through the damper until the damper is compressed by a predetermined amount. Since the torque is transmitted through the coupling body by a certain amount of compression,
The stress applied to the connecting body is less than half that of the conventional one, which has the effect of allowing the device to operate effectively and contributing to miniaturization.

[Brief explanation of drawings]

FIG. 1 is a sectional view schematically showing the main parts of a conventional device;
FIG. 2 is a sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing the main part of the embodiment shown in Fig. 2, Fig. 4 is a plan view showing the main part of the embodiment shown in Fig. 2, and Fig. 5 is a sectional view showing the main part of the embodiment shown in Fig. 2.
The figure is a sectional view showing the torque transmission path of the embodiment shown in FIG. 2. In the figure, 8 is the first connecting body, 8a is the connecting surface, 1
0 and 11 are second connection bodies, 10a and 11a are connection surfaces, 12 is a magnetic particle, 13 is an electromagnetic coil, 1
4 and 15 are storage recesses, 16 is a connecting body, 17 is a damper, 18 is a rotating hub, 18a is an opening, 18b
18c is a spline, and 19 is a rotor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A first connecting body having a connecting surface on the inner periphery, a connecting surface disposed on the inner periphery of the first connecting body and connectable to the connecting surface on the outer periphery, 2 in the axial direction
A second connecting body consisting of two divided members, magnetic particles filled between the respective connecting surfaces, and magnetizing the magnetic particles built in the second connecting body to control the connecting state of the respective connecting surfaces. an electromagnetic coil, a rotating shaft provided on the inner circumferential portion of the second connecting body so as to be able to transmit torque, and a rotating shaft provided so that torque can be transmitted between the second connecting body and the rotating shaft, and the second connecting body being provided so as to be able to transmit torque. A magnetic particle type electromagnetic coupling device comprising a damper hermetically housed between two main coupling members. 2. A first connecting body having a connecting surface on the inner periphery, having a connecting surface on the outer periphery that is disposed on the inner periphery of the first connecting body and capable of connecting with the connecting surface, and 2 in the axial direction.
A second connecting body consisting of two divided members, magnetic particles filled between the respective connecting surfaces, and magnetizing the magnetic particles built in the second connecting body to control the connecting state of the respective connecting surfaces. an electromagnetic coil, which faces between the two members in the inner circumferential portion of the second connection main body with an axial distance between the two members, and has a long hole extending in the circumferential direction in the opposing portion; A rotary plate connected to a rotating shaft, a connecting body passing through a long hole in the rotary plate and having both ends fixed to two members of the second connecting body, and a connecting body between the second connecting body and the rotating plate. A damper is provided so as to be able to engage and transmit torque, and is hermetically housed between the two members of the second connecting body, until the damper is compressed by a predetermined amount. A magnetic particle type electromagnetic coupling device in which torque is transmitted to and from the rotary plate only through the damper, and the torque is transmitted through the coupling body by compressing the damper by a predetermined amount.